Take the narrow road that leads to the lake Embalse de la Pena. It offers great views and is quiet with no other campers around. The area is clean, although you might hear some traffic noise. It's a nice, private location.
The path is narrow and uneven, but we managed to pass through slowly. The location is nice and quiet, near a reservoir and close to a less busy road. There is space for 6 to 7 vehicles, but the main issue is the abundance of mosquitoes due to the water nearby.
The access road is located directly to the left of the parking lot for Restaurant El Jabali. It's a beautiful area for 4x4 vehicles, but the road is in poor condition. After rain, it becomes muddy and has many potholes and rocks, making it risky for regular vehicles.